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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 4,741 $ 4,564
Research and AMT credits 2,664 2,208
Stock based compensation 733 387
Accrued and other 928 748
Deferred Tax Assets, Gross 9,066 7,907
Less valuation allowance (8,520) (7,455)
Deferred tax assets, net of allowance 546 452
Deferred tax liabilities:    
Fixed assets (344) (288)
Goodwill (260) (216)
Deferred tax liabilities (604) (504)
Total deferred tax liabilities $ (58) $ (52)